<%@ page contentType="text/html;charset=UTF-8" language="java" isErrorPage="true"%>
<!DOCTYPE html>
<html>
<head>
<title>隐含对象exception</title>
</head>
<body>
  <%=exception.getMessage() + "<br>"%>
  3秒后返回目录页<br>
  <%
      response.setHeader("refresh", "3;url=contents.html");
  %>
</body>
</html>
